[mrtg] Re: How to correct wrong values in .rrd-files?

[Rich Adamson]

Chris,
This is a known problem with recent versions of mrtg. The problem has been
corrected by the author and the fix will appear in the "pre2" release shortly.

The problem stems from mrtg missing an snmp poll for whatever reason. If a
poll is missed, the next successful poll will calculate the difference between
the new snmp counter (which can be a very large number) and the previous
value (which was incorrectly stored in the log file as zero from the missed
poll).

> I have used MRTG for a longer time and have sometimes experienced problems
> with an IfInOctets/ifOutOctets-value which cannot be true.
> (eg. in our environment - one router with 1Mbit/s serial and
> 100TX-FastEthernet cannot have a load of eg. 7Mbit/s on the LAN-interface
> even if this value is smaller than maybytes)
> 
> Till now we have corrected this by changing the .log/.old-files but how can
> we correct this when using RRDTool. (we must correct it because else the
> graph is unusable with such a high peak)


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